I may be biased because most of my hobbies are in computer science and surrounding topics, but the value people see in Bitcoin (BTC) is (almost) completely derivative of the devaluation of fiat currency.
Why is the value so high? For those that are curious, don't understand, or simply like reading: BTC has a set amount (21 million) to be "mined" or pocketed. The anonymous creator is rumored to have a stash, but regardless, publicly, there will only be 21 million Bitcoin.
Fiat money (obviously) is not a finite resource. Despite the FDIC insurance one may get from a bank, the government will continually print more money whenever they need to. Just like when a company does a stock split and increases the number of shares, the value of the individual share decreases, so does the US dollar. Except when the money printer prints, the holders of "previous" dollars are not given more money to make up for the loss of purchasing power. Since the Federal Reserve took over the banking system in 1913, the purchasing power of $1 has decreased. Needless to say, people are tired of this.
There is no BTC printer. BTC is much like gold or some other precious metal where the scarcity is significant. BTC (unless a BTC printer system emerges) will most likely be perpetually inflationary because of this, regardless of temporary dips.
Why did Bitcoin jump up so high recently? To make the long story short: major players poured major amounts of money into it. Particularly, highly conservative industries like insurance companies just poured large amounts of money into BTC. Here's some articles that detail the investments much better than I could:
Additionally, multiple interviews (take them as you will) from major players with plenty of experience have predicted that BTC will increase up to $400k or $500k, and they put money where their mouth is. The most popular one is Guggenheim's Scott Minerd's interview with Bloomberg.
Is Bitcoin a viable asset right now? Well that depends on how you want to use it. If you expect to use BTC to buy your groceries and pay your bills in 2020, you will not see BTC as a viable asset. BTC is an inflationary asset with high verifiability, fungibility, portability and divisibility. The best use for this (right now) is as a store of value. Considering the last 100+ years of the US Dollar's pitiful performance in maintaining it's power, an idle a cash emergency fund, savings account, uninvested retirement fund is incredibility unwise. Your money may be insured, it may be accepted as a form of payment by Walmart, but it won't do anything. It won't fight the rising prices of goods, and will certainly not bring returns. BTC can solve (and is solving) this problem. And it's solving this problem better than other stores of value.
In the 90s and 00s, people saw the concept of sending electronic messages and mail as a hilarious futuristic fantasy. Regulations and rules will come, but that happens with everything. I would not miss out on very real historical returns and suffer very real losses over possible temporary losses due to regulation. The market in general, has always rebounded and experienced a net increase from a loss, even in little time. We can't say that about cash.
And as far as your cheeky question: Can we really say a new car is worth 1 BTC? Yes, we can. Just like we can say a new house is worth $100,000, and we understand that dollar amounts are divisible and the dollar itself is a unit of measurement, we can now say a new car is worth 1 BTC, and that BTC amounts are divisible and the BTC itself is a unit of measurement.
Why are there losers? The same way there are losers in long-term investing, short-term investing, day trading, and more. Skills. I would not put all my money in BTC just like I wouldn't hold all my wealth in cash, invest in only one stock, or have a portfolio of just rentals, flips, etc. You must diversify. The same goes for BTC and that's where I've seen the most trouble.
Second, there is only a finite amount of BTC. So there's going to be hoarders. A lot of people have romanticized BTC as "the People's currency" simply because it's decentralized and censorship resistant. So they pour their energy, time, and resources into techniques advertised by gurus like mining and Coinbase signups and think they'll be set. This is not correct. BTC will not solve the wealth gap. Those with more wealth and resources will collect and hold the most BTC, and once it's all mined, the biggest hoarders will hold the keys on just how much BTC is flowing between everyone else just like now with money. And this will happen even faster with BTC because halving.
I personally keep about 5-10% of my net worth in BTC. Not enough to kill me, but enough to see it's potential and decide whether or not to pour more into it.